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      <h1 class="f1 athelas mt3 mb1">第四周作业</h1>
      
      
      <time class="f6 mv4 dib tracked" datetime="2020-09-29T11:35:11+08:00">September 29, 2020</time>

      
      
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    <div class="nested-copy-line-height lh-copy serif f4 nested-links nested-img mid-gray pr4-l w-two-thirds-l"><h2 id="asciihttpsenwikipediaorgwikiascii"><a href="https://en.wikipedia.org/wiki/ASCII">ASCII</a></h2>
<p><strong>ASCII</strong>, abbreviated from <strong>American Standard Code for Information Interchange</strong>, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Most modern character-encoding schemes are based on ASCII, although they support many additional characters.
<br/></p>
<h2 id="colorhttpsenwikipediaorgwikicolor"><a href="https://en.wikipedia.org/wiki/Color">Color</a></h2>
<p><strong>Color</strong> (American English), or <strong>colour</strong> (Commonwealth English), is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of photoreceptor cells (in particular cone cells in the human eye and other vertebrate eyes) by electromagnetic radiation (in the visible spectrum in the case of humans). Color categories and physical specifications of color are associated with objects through the wavelengths of the light that is reflected from them and their intensities. 
<br/></p>
<h2 id="1-写出字符a中的-ascii-码unicode-码utf-8-编码">1. 写出字符“A”,“中”的 ASCII 码、Unicode 码、utf-8 编码。</h2>
<h3 id="a-0x410x00410x41">A: 0x41、0x0041、0x41</h3>
<h3 id="中-无0x4e2d0xe4-0xb8-0xad">中： 无、0x4E2D、0xE4 0xB8 0xAD</h3>
<br/>
<h2 id="2-黄色yellow的rgb编码是2552550">2. 黄色(yellow)的RGB编码是(255,255,0)</h2>
<br/>
<h2 id="3-从网上下载一个-bmp-格式图像用图片编辑工具另存在-jpg-pngtiff-格式问三种格式中哪种格式显示质量好相对于-bmp-格式压缩率各是多少">3. 从网上下载一个 BMP 格式图像,用图片编辑工具另存在 jpg、 png、tiff 格式。问三种格式中,哪种格式显示质量好?相对于 BMP 格式,压缩率各是多少?</h2>
<h3 id="tiff显示质量好">tiff显示质量好。</h3>
<h3 id="jpg-1100">jpg: 1~100</h3>
<h3 id="png-1525">png: 15~25</h3>
<h3 id="tiff-1525">tiff: 1.5~2.5</h3>
<br/>
<h2 id="4-winrar压缩文件是lossless-or-lossy-方法">4. Winrar压缩文件是lossless, or lossy 方法？</h2>
<h3 id="lossless-">lossless 。</h3>
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